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O que (quem) é dead code - definição

SECTION IN THE SOURCE CODE OF A PROGRAM WHICH IS EXECUTED BUT WHOSE RESULT IS NEVER USED IN ANY OTHER COMPUTATION. THE EXECUTION OF DEAD CODE WASTES COMPUTATION TIME AND MEMORY

Dead Code; Useless code

dead code

<programming> (Or "infeasible path", "grunge") Any part of a program that can never be accessed because all calls to it have been removed, or because it is guarded by a control structure that provably must always transfer control somewhere else. The presence of dead code may reveal either logical errors due to alterations in the program or significant changes in the assumptions and environment of the program (see also software rot); a good compiler should report dead code so a maintainer can think about what it means. Sometimes it simply means that an *extremely* defensive programmer has inserted can't happen tests which really can't happen - yet. Synonym grunge. [Jargon File] (1996-05-22)

Redundant code

UNNECESARY SOURCE CODE OR COMPILED CODE IN A COMPUTER PROGRAM WHICH CANNOT AFFECT ITS RESULTS

Redundancy (Programming); Redundancy (programming); Nonessential code; Non-essential code

In computer programming, redundant code is source code or compiled code in a computer program that is unnecessary, such as:

https://en.wikipedia.org/wiki/Redundant_code

Dead-code elimination

COMPILER OPTIMIZATION TO REMOVE CODE WHICH DOES NOT AFFECT THE PROGRAM RESULTS

Dynamic dead code elimination; Dynamic dead-code elimination; Dead-code removal; Dead-code stripping; Dead-code strip; Dead code strip; Dead code stripping; Dead code removal; Redundant code elimination; DDCE; Static dead-code elimination; Static dead code elimination; Dynamic Dead Code Elimination; Dynamic dead instruction elimination; Dynamic dead code detection; Dynamic dead instruction detection; Dynamic dead-instruction elimination; Dynamic dead-code detection; Dynamic dead-instruction detection; Partial dead code elimination; Dead instruction elimination; Global dead code elimination; Compile-time dead code removal; Compile-time dead code elimination; Link-time dead code elimination; Link-time dead code removal; Useless-code elimination; Useless code elimination; Global DCE; Run-time DCE; Run-time dead code elimination; Runtime dead code elimination; Runtime DCE; Dynamic DCE; Partial DCE; Unreachable code elimination; Static dead code removal; Static dead code stripping; Dead code elimination

In compiler theory, dead-code elimination (also known as DCE, dead-code removal, dead-code stripping, or dead-code strip) is a compiler optimization to remove code which does not affect the program results. Removing such code has several benefits: it shrinks program size, an important consideration in some contexts, and it allows the running program to avoid executing irrelevant operations, which reduces its running time.

https://en.wikipedia.org/wiki/Dead-code_elimination

Wikipédia

Dead code

The term dead code has multiple definitions. Some use the term to refer to code (i.e. instructions in memory) which can never be executed at run-time. In some areas of computer programming, dead code is a section in the source code of a program which is executed but whose result is never used in any other computation. The execution of dead code wastes computation time and memory.

While the result of a dead computation may never be used, it may raise exceptions or affect some global state, thus removal of such code may change the output of the program and introduce unintended bugs. Compiler optimizations are typically conservative in their approach to dead-code removal if there is any ambiguity as to whether removal of the dead code will affect the program output. The programmer may aid the compiler in this matter by making additional use of static and/or inline functions and enabling the use of link-time optimization.

https://en.wikipedia.org/wiki/Dead code